Ecodiesel power derating as temps rise?

[@californiajeeping]

This engine has a throttle body and swirl valves. The turbo also doesn’t always product full boost. Example you floor it and let off getting turbo bark or surge. The engine snapped the throttle body closed. I think a tune would command it 100% open. I think the torque limiting in the ecu in first and second moves that throttle body causing inconsistent results.

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[CrazyCooter]

Figured I would bump and update this thread with some more useful stuff........I think Jeep fixed/neutered the overheating issue with this last recall calibration.

Just got home from a 5300 mile 16 day roadtrip while towing my RV from Northern CA to Washington, Idaho, Montana North Dakota, South Dakota, Wyoming, Nebraska, Colorado, Utah, Nevada, and back to California over some of the knarliest passes without a single overheat issue......of course she still derates though. I felt wind and the drag of the a RVs frontal area combined with the higher speed limits were our biggest enemy. I never even tried to do the 80mph speed limit and generally stayed around 60mph unless we had a tail wind.

I rolled over the scale on our way out of CA and weighed in at 12,000 even! That is 200lb north of the gcvwr, so we moved some weight around and ditched some stuff like extra water, def, propane, and food along the way to get us right at that 11,800lb rating. We are already thinking about what can be moved and left at home next trip, but its only maybe 200lb of stuff?

No matter what it tried, the truck would not overheat like it used to. It seems 246° water temp and 266° oil temp was the magic numbers because it never exceeded either no matter the grade load, or ambient temp. The only difference is what speed you could sustain. Colder temps allowed higher speeds......cooler temps like 50° would allow me to climb these hills at the posted speed limits at times. When we left home, ambient temp was 98° and 107° on the return. 217° was also the max trans temp and only seemed to occur on harder pulls where the engine was derating and had to use 3rd or 4th gears, but that was expected. Trans always cools right off to 202ish, so they got that system balanced I suppose!

I do feel the truck could benefit from an oil cooler since normal temps were 230/250 under regular loads on flat ground. I was getting concerned about splitting a radiator since plastic can only take so much heat and pressure?

I have another trip coming up thats just me, so lighter supply and food loads, but will be taking a lighter moto min the bed and temps should be warmer yet, so that will be a good test.

 

[ZoneArc]

266 oil temp is very high. Sustained temps that high are not good and will result in engine failure. They may have raised the temp before it goes in to limp mode but that doesn't change the fact that the engine lacks adequete cooling in the JT and therefore its unable to tow on grades when going above 40mph without putting the engine at risk.

 

[CrazyCooter]

266 oil temp is very high. Sustained temps that high are not good and will result in engine failure. They may have raised the temp before it goes in to limp mode but that doesn't change the fact that the engine lacks adequete cooling in the JT and therefore its unable to tow on grades when going above 40mph without putting the engine at risk.

I honestly don't know what the "safe" oil temp is, but it makes me uncomfortable. The temps I'm seeing now are slightly lower than before, so I think they possibly lowered the temps where the power is pulled to keep things from full on exploding. I'd say oil temps on this trip were pretty much 245-250 sustained and peaking at the 266 on a climb.

I have been doing UOA on this truck since new......oil has always tested good and suitable for continued use even at 10k mile interval. OE calls for oil changes to not exceed 10k, so I don't.

This trip has me thinking about going back to a full sized truck even though I don't want the size or the excessive capacity anymore. Lots of go fast suspension parts for a Ram 2500 or F250 though......

 

[Vtur]

I've had seen mine up to 269 oil temp without even towing anything. Ambient temp was 105 though.

 

[CrazyCooter]

I've had seen mine up to 269 oil temp without even towing anything. Ambient temp was 105 though.

We'll see in 2 weeks on the next trip. This has been a weird year and its just now getting hot!

 

[steelponycowboy]

Yeah 266 is just 6 degrees away from limp mode. The last update did nothing. I'm still waiting for an update from a diesel company on a larger radiator but in the meantime, I got a conversion kit for my Rubicon that makes the faux hood louvers actually working ones and it cut my temps 10 to 15 degrees so maybe I am going in the right direction.

 

[ShadowsPapa]

266 oil temp is very high. Sustained temps that high are not good and will result in engine failure. They may have raised the temp before it goes in to limp mode but that doesn't change the fact that the engine lacks adequete cooling in the JT and therefore its unable to tow on grades when going above 40mph without putting the engine at risk.

Right. That's sump temps. The oil shearing in the bearings, sprayed against pistons and so on will reach higher temperatures. That's the oil that slowly starts to vaporize and break down due to heat. it's not a quick process and it's a tiny amount at a tie but it adds up - it's cumulative. So over a longer drive, small bits of oil get closer to 300 degrees and will lose its low parts and eventually every drop of oil will have had a turn at those temperatures.
Depending on the oil, it may have been only 10 degrees or so from the threshold of breakdown - not BROKEN down, but at the doorstep.
Time for an oil change.

 

[smlobx]

Yeah 266 is just 6 degrees away from limp mode. The last update did nothing. I'm still waiting for an update from a diesel company on a larger radiator but in the meantime, I got a conversion kit for my Rubicon that makes the faux hood louvers actually working ones and it cut my temps 10 to 15 degrees so maybe I am going in the right direction.

Care to share who the company is?
Thanks.

 

[@californiajeeping]

Watch your coolant temps oil seems to stay 15-20 above. I still bet the radiator fixes a lot.

 

[steelponycowboy]

Care to share who the company is?
Thanks.

The company working on a radiator solution is Bullet Proof Diesel.

The Hood Vent conversion is https://www.facebook.com/OTBDesignFab/ I met them at the Moab EJS, they had completely sold out of product, ordered one the next week and installed it right away, I now have over 6,000 miles with them on and while I don't have any way of doing scientific tests, I can tell you that overall they have reduced my engine temps 10 to 15 degrees.

 

[smlobx]

^^^
Thanks for the link. The hood vents are available here for anyone who is interested…

https://www.ironrockoffroad.com/pro...yFkXPGdjuvciK0NWSNIMMC8fJ1kaiM3uz6yH9trPIeVJE

I really liked the video where the guy shows that water poured into the vent gets routed to the outside of the hood, not onto the engine. I wonder why Jeep didn’t do this initially. It makes so much sense!

 

[NCJL]

The company working on a radiator solution is Bullet Proof Diesel.

You got some inside info?
That Radiator has been talked about for 2/3 years.
It would be nice.

 

[PJZ]

There are a bunch of postings where you can DIY those hood vents in under 30 mins for free. Very simple mod. Probably doesn't have much impact in the grand scheme of things.

 

[Jefe1018]

I wasn’t towing anything yesterday, coming up the steeper hills from Utah into Vegas I saw temps as high as 256 in keeping up with traffic, no towing. I still haven’t derated but I sure do keep an eye on those temps in the summer.

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